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The symptom I had was a loud squeal, not grinding, so your problem may be different!
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Sounds very different. My problem is definitely caused by gear teeth clashing resulting in progressively worsening damage.
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BTW, is there anything behind the ring gear that the starter drive gear could make contact with after it is (too) fully engaged?
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No.
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Another thought: There are two different starter drive gears if my recall is accurate. One is for a flywheel and the other for a flexplate which - I think - have different numbers of teeth.
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The one I've been ordering says that it's compatible with a 1974 Thunderbird 7.5L. Those all came with C6 3-speed automatic transmissions (which is what I'm using).